The core difference: work history versus income need

SSDI (Social Security Disability Insurance) is based on your own work record and the taxes you paid into Social Security. SSI (Supplemental Security Income) is based on financial need, not work history. If you have worked and paid Social Security taxes for a certain number of years, you may receive SSDI. If you have little or no work history, or your income and assets fall below a threshold, you may receive SSI instead.

The two programs use the same medical definition of disability — you must have a condition that prevents substantial work and is expected to last at least 12 months or result in death. But the path to proving you may have access to is different, and the monthly payment amount works differently too.

Some people receive both SSDI and SSI at the same time, though this is less common. Understanding which one you might receive affects how much money you get, what happens if you work, and what other benefits come with it.

Key Takeaways

  • SSDI requires you to have worked and paid Social Security taxes for a certain number of years; SSI requires little or no work history but looks at your current income and assets.
  • SSDI payments are based on your past earnings; SSI payments are a fixed federal amount that changes yearly, currently $943 per month for an individual in 2024.
  • SSDI comes with Medicare after two years; SSI comes with Medicaid when ready in most states.
  • If you work while receiving SSDI, your benefits stop after you earn more than $1,550 per month; SSI has a $65 monthly work exclusion and then counts half of remaining earnings.
  • You can receive both programs at once if you meet the work history requirement for SSDI but your SSDI payment is very low.

How work history determines which program you receive

To receive SSDI, you must have worked long enough and recently enough to have earned enough Social Security credits. The exact number of credits you need depends on your age when you become disabled. Generally, you need 40 credits total, with at least 20 earned in the 10 years before you became disabled. You earn one credit for each $1,730 of earnings in 2024 (this amount changes yearly), up to four credits per year.

If you have never worked, worked very little, or worked a long time ago without paying Social Security taxes, you will not meet the SSDI requirement. In that case, you may still receive SSI if your current income and assets are low enough. SSI has no work history requirement at all.

Social Security will look at your actual work record when you file. If you do not have enough credits for SSDI, the agency will tell you that you may be able to receive SSI instead and will help you file for it.

Monthly payment amounts: earnings-based versus need-based

SSDI payments are calculated from your average earnings over your working life. The higher your past earnings, the higher your SSDI payment. Payments range widely — some people receive a few hundred dollars per month, others over $3,000, depending on how much they earned while working.

SSI payments are the same for everyone in the same situation (individual, couple, or living in someone else's household). The federal SSI payment for an individual is $943 per month in 2024. Some states add money on top of the federal amount, so your total SSI payment may be higher depending on where you live. The federal amount increases each year with the cost of living.

If you receive SSDI but your payment is very low — for example, because you did not earn much during your working years — you may also receive a small SSI payment to bring your total up to the SSI federal rate. This is called concurrent benefits.

Healthcare coverage that comes with each program

SSDI recipients receive Medicare after they have been receiving benefits for two years. Medicare is health insurance that covers hospital stays, doctor visits, and prescription drugs (with some gaps you may need to fill with other coverage). You do not have to be retired to receive Medicare through SSDI — you just have to have been on SSDI for 24 months.

SSI recipients receive Medicaid when ready in most states, with no waiting period. Medicaid is a joint federal and state program that covers doctor visits, hospital stays, and many other services. The exact coverage varies by state. In a few states, you must wait a short time or meet additional requirements, but in most places, Medicaid starts right away when your SSI begins.

If you have employer health insurance or coverage through a family member, you can keep it while receiving either SSDI or SSI. The programs do not require you to drop other coverage.

How earnings affect your benefits if you work

If you receive SSDI and you work, your benefits will stop once your monthly earnings exceed $1,550 (in 2024). This is called the substantial gainful activity (SGA) limit. If you earn less than this amount, you can continue receiving your full SSDI payment. If you earn more, your benefits stop, though you may be able to receive them again later if your earnings drop back below the limit.

SSI has a different work incentive. The first $65 of monthly earnings does not count against your SSI payment, and then half of the remaining earnings do not count. For example, if you earn $200 per month, $65 is excluded, leaving $135. Half of $135 ($67.50) does not count, so only $67.50 reduces your SSI payment. This means you can work and still receive some SSI as long as your earnings stay below a certain level.

Both programs have other work incentives designed to help you return to work without losing all your benefits at once. These include trial work periods, extended may be able to access, and plans to achieve self-support (PASS). The rules are complex, and it is worth asking Social Security about them before you start working.

Income and asset limits for SSI

SSI has strict limits on how much income and assets you can have. Your countable income cannot exceed $943 per month (the federal SSI rate) in 2024. Your countable assets cannot exceed $2,000 if you are an individual or $3,000 if you are a couple.

Not all income counts. For example, the first $20 of monthly income is not counted, and certain types of income (like food stamps or housing information) do not count at all. Not all assets count either — your home, one car, and certain other items are excluded from the asset limit.

SSDI has no income or asset limits. You can receive SSDI no matter how much money you have or how much you earn (though earning too much will stop your benefits under the SGA rule). This is one major advantage of SSDI if you have savings or family support.

How to know which program you might receive

When you file for disability benefits with Social Security, the agency will determine which program you may have access to for based on your work history and current financial situation. You do not choose between them — Social Security makes the information.

If you have a work history that meets the SSDI requirement, you will be evaluated for SSDI first. If you do not have enough work credits, or if your SSDI payment would be very low, Social Security will also evaluate you for SSI.

You can file for both programs at the same time by submitting one process. You can file online at ssa.gov, by phone at 1-800-772-1213, or in person at your local Social Security office. The process asks about your work history, current income, assets, and medical condition. Bring documents that show your earnings history (tax returns or W-2 forms) and proof of your disability (medical records, test results, letters from doctors).

Frequently Asked Questions

Can I receive both SSDI and SSI at the same time?

Yes, if you have enough work credits for SSDI but your SSDI payment is very low. Social Security will pay you SSDI first, then add SSI on top to bring your total payment up to the federal SSI rate. This is called concurrent benefits and is less common than receiving one program alone.

What happens to my SSDI if I go back to work?

Your SSDI stops if you earn more than $1,550 per month (in 2024). However, you have a nine-month trial work period where you can earn any amount without losing benefits. After that, if you earn over the limit, benefits stop but may restart if your earnings drop again.

Do I lose SSI if I inherit money or receive a gift?

Gifts and inheritances count as assets for SSI purposes. If your total assets exceed $2,000, your SSI stops until your assets fall back below the limit. You can spend down assets on living expenses, medical care, or certain approved items. SSDI has no asset limit, so inheritance does not affect it.

Which program gives better health insurance?

SSDI gives you Medicare, which is federal health insurance. SSI gives you Medicaid, which varies by state but often covers more services with lower out-of-pocket costs. Neither is universally "better" — it depends on your state and your medical needs. Both are valuable.

How long does it take to be approved for SSDI or SSI?

Initial decisions usually take three to six months, though some cases take longer if your medical evidence is incomplete. If you are denied, you can appeal. The appeals process can take another year or more. Many people are denied initially and approved on appeal, so do not give up if you receive a denial letter.